Watch movement balance part



FIG. 1 is a top perspective view of a watch movement balance part showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom thereof.

The portions of the watch movement balance part shown in broken lines form no part of the claimed design. 

The ornamental design for a watch movement balance part, as shown and described. 